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This script makes the timeline frame be that of the current selected frame in the Graph Editor. It creates a new menu item in the Keys menu of the Graph Editor.
It is conceived from a fellow animator's suggestion. It can make your life easier when you are refining your animation, or not. It is up to you.
Note: when you are in the graph editor and switch to the Dope Sheet this functionality is still on, so it is better to turn it off in order not to receive warning messages when you select more than one key in the Dope Sheet. If you want to manually toggle this functionality run
from the Script Editor. It is an issue that maybe I'll try to solve.